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NUS3055MUTAG
Schottky
AC/DC Adapter of
Diode
Accessory Charger
V CC
SRC
DRAIN
P?CH
IN
Undervoltage
Lock Out
GATE
+
+
?
Logic
FET
Driver
OUT
C1
LOAD
V ref
NUS3055
GND
CNTRL
Microprocessor Port
Figure 1. Simplified Schematic
PIN FUNCTION DESCRIPTIONS
Pin #
1
2
3
4
5
6
7
8
Symbol
IN
GND
CNTRL
DRAIN
SRC
GATE
OUT
V CC
Pin Description
This pin senses an external voltage point. If the voltage on this input rises above the overvoltage threshold
(V TH ), the OUT pin will be driven to within 1.0 V of V CC , thus disconnecting the P?Channel Power MOSFET. The
nominal threshold level is 6.85 V and this threshold level can be increased with the addition of an external
resistor between IN and V CC .
Circuit Ground
This logic signal is used to control the state of OUT and turn?on/off the P?Channel Power MOSFET. A logic High
results in the OUT signal being driven to within 1.0 V of V CC which disconnects the FET. If this pin is not used,
the input should be connected to ground.
Drain pin of the P?Channel Power MOSFET
Source pin of the P?Channel Power MOSFET
Gate pin of the P?Channel Power MOSFET
This signal drives the gate of a P?Channel Power MOSFET. It is controlled by the voltage level on IN or the logic
state of the CNTRL input. When an overvoltage event is detected, the OUT pin is driven to within 1.0 V of V CC in
less than 1.0 _sec provided that gate and stray capacitance is less than 12 nF.
Positive Voltage supply. If V CC falls below 2.8 V (nom), the OUT pin will be driven to within 1.0 V of V CC , thus
disconnecting the P?channel FET.
OVERVOLTAGE PROTECTION CIRCUIT TRUTH TABLE
IN
<V th
<V th
>V th
>V th
CNTRL
L
H
L
H
OUT
GND
V CC
V CC
V CC
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